质疑基在黄金中的反插入 (III)
Jaime Martín1, Johannes Schörgenhumer1, Cristina Nevado1
1Department of Chemistry, University of Zurich, Winterthurerstrasse 190, Zurich, CH 8057, Switzerland.
JACS Au
|March 28, 2025
概括
这项研究揭示了一种新的反马尔科夫尼科夫基因插入到金化物中的新型反马尔科夫尼科夫基因插入,这是一个罕见的反应. 水加快了这种双分子过程,产生Z-乙烯基金复合物.
科学领域:
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
- 合成有机化学 合成有机化学
背景情况:
- 基因水功能化是合成复杂分子的关键.
- 同步插入机制是众所周知的,但反插入不太常见,并且在机制上不清楚.
- 金复合物是有效的催化剂,但它们的基因插入机制需要进一步阐明.
研究的目的:
- 为了研究基因插入黄金 (III) - 化物中的机制.
- 为了证明选择性的抗马尔科夫尼科夫基因插入.
- 为了阐明水在黄金催化基因转换中的作用.
主要方法:
- 使用稳定的黄金 (III) -化物复合物与 (P^N^C) 连接体.
- 进行了对照实验和运动研究.
- 进行计算分析以了解反应路径.
主要成果:
- 实现了各种基因的选择性反马尔科夫尼科夫插入到金 (III) 化物中.
- 确定了一种非根性的双分子插入机制.
- 证明水加速反应并稳定黄金的中间体.
结论:
- 这项工作提供了第一个实验证据,证明反马尔科夫尼科夫的基因被插入到金化物中.
- 这些发现为金催化基因反应提供了新的机制性见解.
- 该研究强调了水在促进这种转变中的关键作用.
相关概念视频
02:27Preparation of Alkynes: Alkylation Reaction
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
02:34Preparation of Alkynes: Dehydrohalogenation
Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
02:38Electrophilic Addition to Alkynes: Halogenation
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
02:35Electrophilic Addition to Alkynes: Hydrohalogenation
Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.